Nothing happens when I click "Watch"

I’ve been doing various Google searches regarding woodworking & SketchUp. When I follow a link to lumberjocks that contains a video, I’m taken to the correct page (I think), but only all the responses show up. Clicking on the Watch button in the upper right does nothing except cause the button to change to Unwatch.

This is on a MacBook using either Firefox or Safari.

Thanks,festus

-- “We have constructed a world in which the potential for high-tech catastrophe is embedded in the fabric of day-to-day life.” Malcolm Gladwell